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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee7c33b07927875f94c92fabd477df5321d369626933b6f7227f9d342fb9d29b' 
  AND token = 'Tl9+CG8dh3pnaov7ng/tGWrZo5AuDySgtXEP+FVUsD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}